http://www.amazon.com/gp/help/custom...deId=200790620
From the file size it seems to be a full update instead of delta.
EDIT: yup, complete system update with kernel, boot loader, recovery, and system. All apks, libs, etc. Signed, unfortunately.
EDIT 2: also, seeing that the fire runs Kindle 6.0 (even though it is nothing like the older kindle software) and the Non-Touch runs 4.0, I'm going to take a wild guess and say the touch will run 5.0. Should we call it the Kindle 5?
EDIT 3: Aaaand I'm right. Also, the source is out. This is like Christmas for me, lol.
http://www.amazon.com/gp/help/custom...deId=200203720